Chromosomes of four species of Commelina (Commelinaceae)

Chromosome numbers, meiotic behaviour and karyotypes in 27 populations belonging to four species of Commelina L. from north‐east Argentina and Paraguay have been studied. The basic number of chromosomes in all accessions is x = 15. For C. platyphylla Klotzsch ex Seub. (2n = 2x = 30) the chromosome n...

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Bibliographic Details
Published in:Botanical journal of the Linnean Society 2005-06, Vol.148 (2), p.207-218
Main Authors: Grabiele, M, Davina, J.R, Honfi, A.I
Format: Article
Language:English
Subjects:
chromosomes
Commelina
Commelina diffusa
Commelina erecta
Commelina obliqua
Commelina platyphylla
Commelinaceae
karyotypes
karyotyping
meiosis
meiotic behaviour
plant genetics
polyploidy
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Summary:Chromosome numbers, meiotic behaviour and karyotypes in 27 populations belonging to four species of Commelina L. from north‐east Argentina and Paraguay have been studied. The basic number of chromosomes in all accessions is x = 15. For C. platyphylla Klotzsch ex Seub. (2n = 2x = 30) the chromosome number is reported for the first time. A new ploidy level (2n = 6x = 90) is presented for South American accessions of C. diffusa Burm. f. Commelina erecta L. and C. obliqua Vahl are tetraploids (2n = 4x = 60). Chromosomes behave regularly at meiosis and pair as bivalents in diploid and polyploid accessions. Chiasma frequency and distribution is reported for each species. The karyotype descriptions of C. platyphylla (18m + 12sm), C. obliqua (30m + 26sm + 4st) and hexaploid C. diffusa (38m + 44sm + 8st) are reported here for the first time. The data suggest an allopolyploid condition for tetraploids of C. erecta and C. obliqua. © 2005 The Linnean Society of London, Botanical Journal of the Linnean Society, 2005, 148, 207–218.
ISSN:0024-4074
1095-8339
DOI:10.1111/j.1095-8339.2005.00401.x